Automotive Transmission Systems

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Questions and Answers

What is the purpose of the housing in a fluid coupling?

To transmit power to the output shaft

To rotate the input turbine

To contain the fluid and turbines with an oil-tight seal (correct)

To act as a mechanical clutch

What is the direction of the fluid motion in a fluid coupling when the input and output stages have identical angular velocities?

Circular and co-axial with the axis of rotation (correct)

Toroidal with a circular component

Inwards towards the center of the torus

Linear and rotational

What is the function of the pump or impellor in a fluid coupling?

To impart linear and rotational motion to the fluid (correct)

To rotate the output turbine

To act as a mechanical clutch

To contain the hydraulic fluid

What happens to the fluid motion in a fluid coupling when there is a difference between input and output angular velocities?

The fluid motion becomes toroidal with a circular component Signup and view all the answers

What is the typical source of power for the prime mover in a fluid coupling?

Electric motor or internal combustion engine Signup and view all the answers

What is the function of the output turbine or driven member in a fluid coupling?

To cause a torque due to the difference in angular velocities Signup and view all the answers

What is the shape of the path of the fluid motion in a fluid coupling?

Toroidal Signup and view all the answers

What is the purpose of using a fluid coupling in an automobile transmission?

To transmit power from the engine to the gearbox Signup and view all the answers

What is the primary function of a transmission system in a vehicle?

To provide high torque at the time of starting, hill climbing, and accelerating Signup and view all the answers

What is the purpose of a free wheeling mechanism in a transmission system?

To disconnect the engine and the road wheels Signup and view all the answers

What is the difference between a sliding mesh gear box and a constant mesh gear box?

The way the gears engage and disengage Signup and view all the answers

What is the purpose of a torque converter in an automatic transmission system?

To convert mechanical energy into hydraulic energy Signup and view all the answers

What is the main advantage of an epicyclic gear box in an automatic transmission system?

It is compact and lightweight Signup and view all the answers

What is the purpose of a fluid coupling or hydraulic coupling in a transmission system?

To transmit rotating mechanical power Signup and view all the answers

What is the main difference between a manual transmission and an automatic transmission?

The driver's involvement in gear shifting Signup and view all the answers

What is the purpose of a planetary gear system in a transmission system?

To provide a variable torque output Signup and view all the answers

Study Notes

Transmission System (Gear Box)

Necessity for Gear Ratios

Gear box provides gear ratios in transmission to control speed
Synchronous gear boxes, 3, 4, and 5 speed gear boxes are examples
Free Wheeling mechanism, Planetary gear systems, overdrives, fluid coupling, and torque converters are used

Automotive Gears

Gears play an important role in controlling speed in vehicles
Types of gears: ring and pinion, spiral gear, hypoid gear, hydraulic gears, reduction gearbox
Gear size varies depending on vehicle size
Low gears cover shorter distances and are useful at low speeds
High gears have a larger number of teeth

Functions of Transmission

Provides high torque at starting, hill climbing, accelerating, and pulling a load
Permits engine crankshaft to revolve at high speed while wheels turn at slower speeds
Provides variable torque through a set of gears
Allows changing vehicle speed while keeping engine speed the same (within a certain limit)
Provides a neutral position to disconnect engine and road wheels
Enables backing the car by reversing the direction of rotation of the drive

Necessity of Transmission

Variation of resistance to vehicle motion at various speeds
Variation of tractive effort of the vehicle available at various speeds

Types of Transmission

Manual Transmission

Sliding Mesh Gear box
Constant Mesh Gear box
Synchromesh Gear box

Automatic Transmission

Overdrive (semi-automatic)
Fluid drive or Fluid coupling
Fully automatic
- Epicyclic gear box
- Free Wheeling unit
- Torque Convertor

Fluid Coupling or Torque Convertor

Hydrodynamic device used to transmit rotating mechanical power
Alternative to a mechanical clutch in automobile transmission
Consists of:
- Housing (shell) containing the fluid and turbines
- Two turbines: pump (input shaft) and turbine (output shaft)
- Hydraulic fluid
Working principle:
- Input shaft rotates the pump, imparting linear and rotational motion to the fluid
- Fluid is directed towards the output turbine, causing a torque and rotation
- Motion of the fluid is toroidal, with a circular component when input and output angular velocities differ

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Description

This quiz covers the basics of transmission systems, including gear boxes, gear ratios, and other mechanisms used in automotive vehicles. Learn about the different types of gear boxes and their applications.